1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file COPYING in the main directory of this archive
 4 * for more details.
 5 */
 6
 7#include <linux/module.h>
 8#include <linux/string.h>
 9
10void *memcpy(void *to, const void *from, size_t n)
11{
12	void *xto = to;
13	size_t temp, temp1;
14
15	if (!n)
16		return xto;
17	if ((long)to & 1) {
18		char *cto = to;
19		const char *cfrom = from;
20		*cto++ = *cfrom++;
21		to = cto;
22		from = cfrom;
23		n--;
24	}
25#if defined(CONFIG_M68000)
26	if ((long)from & 1) {
27		char *cto = to;
28		const char *cfrom = from;
29		for (; n; n--)
30			*cto++ = *cfrom++;
31		return xto;
32	}
33#endif
34	if (n > 2 && (long)to & 2) {
35		short *sto = to;
36		const short *sfrom = from;
37		*sto++ = *sfrom++;
38		to = sto;
39		from = sfrom;
40		n -= 2;
41	}
42	temp = n >> 2;
43	if (temp) {
44		long *lto = to;
45		const long *lfrom = from;
46#if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)
47		for (; temp; temp--)
48			*lto++ = *lfrom++;
49#else
50		asm volatile (
51			"	movel %2,%3\n"
52			"	andw  #7,%3\n"
53			"	lsrl  #3,%2\n"
54			"	negw  %3\n"
55			"	jmp   %%pc@(1f,%3:w:2)\n"
56			"4:	movel %0@+,%1@+\n"
57			"	movel %0@+,%1@+\n"
58			"	movel %0@+,%1@+\n"
59			"	movel %0@+,%1@+\n"
60			"	movel %0@+,%1@+\n"
61			"	movel %0@+,%1@+\n"
62			"	movel %0@+,%1@+\n"
63			"	movel %0@+,%1@+\n"
64			"1:	dbra  %2,4b\n"
65			"	clrw  %2\n"
66			"	subql #1,%2\n"
67			"	jpl   4b"
68			: "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1)
69			: "0" (lfrom), "1" (lto), "2" (temp));
70#endif
71		to = lto;
72		from = lfrom;
73	}
74	if (n & 2) {
75		short *sto = to;
76		const short *sfrom = from;
77		*sto++ = *sfrom++;
78		to = sto;
79		from = sfrom;
80	}
81	if (n & 1) {
82		char *cto = to;
83		const char *cfrom = from;
84		*cto = *cfrom;
85	}
86	return xto;
87}
88EXPORT_SYMBOL(memcpy);

 1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file COPYING in the main directory of this archive
 4 * for more details.
 5 */
 6
 7#include <linux/module.h>
 8#include <linux/string.h>
 9
10void *memcpy(void *to, const void *from, size_t n)
11{
12	void *xto = to;
13	size_t temp, temp1;
14
15	if (!n)
16		return xto;
17	if ((long)to & 1) {
18		char *cto = to;
19		const char *cfrom = from;
20		*cto++ = *cfrom++;
21		to = cto;
22		from = cfrom;
23		n--;
24	}
 
 
 
 
 
 
 
 
 
25	if (n > 2 && (long)to & 2) {
26		short *sto = to;
27		const short *sfrom = from;
28		*sto++ = *sfrom++;
29		to = sto;
30		from = sfrom;
31		n -= 2;
32	}
33	temp = n >> 2;
34	if (temp) {
35		long *lto = to;
36		const long *lfrom = from;
37#if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)
38		for (; temp; temp--)
39			*lto++ = *lfrom++;
40#else
41		asm volatile (
42			"	movel %2,%3\n"
43			"	andw  #7,%3\n"
44			"	lsrl  #3,%2\n"
45			"	negw  %3\n"
46			"	jmp   %%pc@(1f,%3:w:2)\n"
47			"4:	movel %0@+,%1@+\n"
48			"	movel %0@+,%1@+\n"
49			"	movel %0@+,%1@+\n"
50			"	movel %0@+,%1@+\n"
51			"	movel %0@+,%1@+\n"
52			"	movel %0@+,%1@+\n"
53			"	movel %0@+,%1@+\n"
54			"	movel %0@+,%1@+\n"
55			"1:	dbra  %2,4b\n"
56			"	clrw  %2\n"
57			"	subql #1,%2\n"
58			"	jpl   4b"
59			: "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1)
60			: "0" (lfrom), "1" (lto), "2" (temp));
61#endif
62		to = lto;
63		from = lfrom;
64	}
65	if (n & 2) {
66		short *sto = to;
67		const short *sfrom = from;
68		*sto++ = *sfrom++;
69		to = sto;
70		from = sfrom;
71	}
72	if (n & 1) {
73		char *cto = to;
74		const char *cfrom = from;
75		*cto = *cfrom;
76	}
77	return xto;
78}
79EXPORT_SYMBOL(memcpy);